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参数资料
| 型号： | AD822BRZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 1.9MHZ LP 8SOIC |
| 设计资源： | 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064) |
| 标准包装： | 750 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 3 V/µs |
| 增益带宽积： | 1.9MHz |
| -3db带宽： | 1.9MHz |
| 电流 - 输入偏压： | 2pA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 1.4mA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
AD822
Rev. I | Page 19 of 24
90
... .
....
.... .... .... .... .... .... .... . ...
....
.... . ... . ... .... .... .... .... . ...
100
0%
10
20mV
2s
00
87
4-
0
44
Figure 44. Small Signal Response of AD822 as
Unity-Gain Follower Driving 350 pF
Figure 45 is a plot of noise gain vs. capacitive load that results in
a 20° phase margin for the AD822. Noise gain is the inverse of
the feedback attenuation factor provided by the feedback
network in use.
1
2
3
4
5
300
1k
3k
10k
30k
CAPACITIVE LOAD FOR 20° PHASE MARGIN (pF)
NO
IS
E
G
AI
N
1+
R
F
R
1
R1
RF
CL
00
87
4-
0
45
Figure 45. Noise Gain vs. Capacitive Load Tolerance
Figure 46 shows a method for extending capacitance load drive
capability for a unity-gain follower. With these component
values, the circuit drives 5000 pF with a 10% overshoot.
20pF
100
20k
8
4
VIN
V+
0.01F
VOUT
0.01F
CL
1/2
AD822
+
–
V–
00
87
4-
0
46
Figure 46. Extending Unity-Gain Follower Capacitive Load Capability
Beyond 350 pF
SINGLE-SUPPLY VOLTAGE-TO-FREQUENCY
CONVERTER
The circuit shown in Figure 47 uses the AD822 to drive a low
power timer that produces a stable pulse of width t1. The positive
going output pulse is integrated by R1 and C1 and used as one
input to the AD822 that is connected as a differential integrator.
The other input (nonloading) is the unknown voltage, VIN. The
AD822 output drives the timer trigger input, closing the overall
feedback loop.
2
3
4
6
5
U3A
U3B
C3
0.1F
1
2
3
4
OUT2
OUT1
U1
C1
U2
CMOS 555
THR
TR
DIS
GND
OUT
CV
1
2
3
4
5
6
7
8
RV+
C4
0.01F
R3
116k
0.01F, 2%
CMOS
74HCO4
RSCALE
10k
U4
REF02
VREF = 5V
10V
C5
0.1F
R2
499k
1%
R1
499k
1%
VIN
C2
0.01F
2%
0V TO 2.5V
FULL SCALE
1/2
AD822B
+
–
NOTES
1. fOUT = VIN/(VREF × t1), t1 = 1.1 × R3 × C6.
2. R3 = 1% METAL FILM <50ppm/°C TC.
3. RSCALE = 10% 20T FILM <100ppm/°C TC.
4. t1 = 33F FOR fOUT = 20kHz @ VIN = 2.0V.
= 25kHz
fS AS SHOWN.
0
08
74-
047
Figure 47. Single-Supply Voltage-to-Frequency Converter
Typical AD822 bias currents of 2 pA allow MΩ range source
impedances with negligible dc errors. Linearity errors on the
order of 0.01% full scale can be achieved with this circuit. This
performance is obtained with a 5 V single supply that delivers
less than 1 mA to the entire circuit.
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